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Neutralization–reionization efficiencies for gaseous [C 3 H n ]+ Ions
Author(s) -
Wesdemiotis Chrysostomos,
Feng Rong
Publication year - 1988
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210230520
Subject(s) - reionization , degree of unsaturation , ion , chemistry , radical , carbocation , hydrocarbon , molecule , neutralization , analytical chemistry (journal) , photochemistry , ionization , organic chemistry , antibody , immunology , biology
A neutralization‐reionization study of [C 3 H n ] + ions, n = 6−0, shows that neutralization efficiencies are larger for hydrocarbon radical cations than they are for even‐electron carbocations with one more H atom. Reionization efficiencies to positive ions do not depend appreciably on the electronic properties of the neutral species undergoing reionization. However, reionization efficiencies to negative ions increase dramatically with the degree of unsaturation, by nearly two orders of magnitude, from C 3 H 6 to C 3 . All C 3 H n neutrals studied survive intact neutralization to produce a considerable fraction of stable, non‐dissociating [C 3 H n ] + upon cationization. All C 3 H n radicals (n = 5, 3, 1) can be transferred collisionally to stable even‐electron anions. For the C 3 H n hydrocarbon molecules studied ( n = 6, 4, 2, 0) the stability of the molecular radical anion increases substantially with the degree of unsaturation.